Microstructural effects on fracture resistance in TiAl-base alloys
- Southwest Research Inst., San Antonio, TX (United States)
The role of microstructure in imparting fracture resistance in TiAl-base alloys is reviewed to assess the state of the art. Contributions to initiation and crack growth toughnesses by deformation processes near the crack tip and in the crack wake ligaments are delineated, and the controlling microstructural parameters established. Effects of microstructural variables such as volume fraction of lamellar grains, grain size, and lamellae spacing, on fracture toughness and tensile ductility are considered in terms of micromechanical models. Toughness improvement for TiAl-alloys by microstructural control is investigated with the aid of the models. The theoretical result of optimum microstructures for achieving balanced properties of toughness and ductility is evaluated against experimental data.
- OSTI ID:
- 225158
- Report Number(s):
- CONF-950201--; ISBN 0-87339-304-X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
BORON ADDITIONS
CHROMIUM ALLOYS
CRACK PROPAGATION
CRACKS
DUCTILITY
ELONGATION
EXPERIMENTAL DATA
FRACTURE MECHANICS
FRACTURE PROPERTIES
GRAIN SIZE
INTERMETALLIC COMPOUNDS
LAMELLAE
MANGANESE ADDITIONS
MICROSTRUCTURE
NIOBIUM ALLOYS
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN ADDITIONS
VANADIUM ALLOYS